I have heard that you can have TOO MUCH skimmer. That it won't pull anymore nutrients than one that's rated just a little over what you have. But I also think this depends on the skimmer. I have heard that certain Reef Octopus skimmers are underrated for how they perform. But I can't really say if the Cad LIGHTS skimmer will perform this way or not. As far as starving out your corals, I don't think that is a reality when you run ecobak. You can feed your tank super heavy and it doesnt add the typical trates and phates that it would normally. Jon Warner suggests that you feed the tank heavy in order for the ecobak to really work at it's full capacity. And as long as you target feed your corals, I don't think you have to worry about starving them out due to an overrated skimmer.
I would say now, you only have a light to medium bioload. But if you were to go with the CAD lights skimmer, you would be free to load your tank up, and wouldn't have to worry about a new skimmer, if and when you
upgrade the size of your tank.